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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
3 groove Barrels
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<blockquote data-quote="Fiftydriver" data-source="post: 222349" data-attributes="member: 10"><p>When I was wringing out my 7mm Allen Magnum with the Lilja 3 groove barrels, I ran into problems when the barrels got roughly 200-300 rounds down the barrel. </p><p> </p><p>Shooting the 200 gr ULD RBBT from wildcat bullets using the J-4 jacket, they would shoot great to start with and then the bullets would start coming apart and eventually every one shot, no matter the velocity used would tear the bullets apart.</p><p> </p><p>Mike Rock contacted me after hearing about my problems and said he had the cure all for my problems. He sent me a 1-8.7 5R barrel out to try and see what happened telling me I would never have a bullet fail again.</p><p> </p><p>Got the barrel fitted and took the rifle out to the range. At 500 yards, the first shot landed predictably, shot number two turned to dust as did every bullet after that......</p><p> </p><p>I am not hammering on Rock barrels, I worked with James who is the head barrel maker to have him design a thinner rifling design that worked extremely well with no problems at all.</p><p> </p><p>It all comes down to baring surface compression(BSC). The 3 groove barrels will be up in the 30% range for baring surface compression. I do not have the exact numbers but in comparision, the numbers looked something like this comparing several barrels in 7mm bore.</p><p> </p><p> </p><p>Rock 5R........................35%</p><p>Lilja 3 groove.................30%</p><p>Lilja 4 groove.................22%</p><p>Lilja 6 groove.................20%</p><p> </p><p>I have never had a problem with the 4 or 6 groove barrels. I had serious problems with the original Rock design and most of the Lilja barrels in 3 groove gave me problems as well. Again, all when using the J-4 based bullets.</p><p> </p><p>BSC % is simply a function of the area a bullet is compressed by the lands. Really has very little if anything to do with the width of a single land in and of itself.</p><p> </p><p>If a 3 groove land was the same width as a 6 groove land, they would have no problems at all with thin jacketed bullets.</p><p> </p><p>As far as barrel life goes, again we need to look at a single land to figure out which rifling design will last longest. Just because there are only 3 lands in a barrel does not nessesarily mean it will have the longest barrel life.</p><p> </p><p>If you took a 3 groove, 4 groove, 5 groove and 6 groove all having the same land width, they would all have the same barrel life given that all barrels were made from the same material and hardness of material.</p><p> </p><p>The wider the land crosssection, the longer it will take to erode from firing, simple as that, the thinner the cross section of the land, the faster it will erode.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 222349, member: 10"] When I was wringing out my 7mm Allen Magnum with the Lilja 3 groove barrels, I ran into problems when the barrels got roughly 200-300 rounds down the barrel. Shooting the 200 gr ULD RBBT from wildcat bullets using the J-4 jacket, they would shoot great to start with and then the bullets would start coming apart and eventually every one shot, no matter the velocity used would tear the bullets apart. Mike Rock contacted me after hearing about my problems and said he had the cure all for my problems. He sent me a 1-8.7 5R barrel out to try and see what happened telling me I would never have a bullet fail again. Got the barrel fitted and took the rifle out to the range. At 500 yards, the first shot landed predictably, shot number two turned to dust as did every bullet after that...... I am not hammering on Rock barrels, I worked with James who is the head barrel maker to have him design a thinner rifling design that worked extremely well with no problems at all. It all comes down to baring surface compression(BSC). The 3 groove barrels will be up in the 30% range for baring surface compression. I do not have the exact numbers but in comparision, the numbers looked something like this comparing several barrels in 7mm bore. Rock 5R........................35% Lilja 3 groove.................30% Lilja 4 groove.................22% Lilja 6 groove.................20% I have never had a problem with the 4 or 6 groove barrels. I had serious problems with the original Rock design and most of the Lilja barrels in 3 groove gave me problems as well. Again, all when using the J-4 based bullets. BSC % is simply a function of the area a bullet is compressed by the lands. Really has very little if anything to do with the width of a single land in and of itself. If a 3 groove land was the same width as a 6 groove land, they would have no problems at all with thin jacketed bullets. As far as barrel life goes, again we need to look at a single land to figure out which rifling design will last longest. Just because there are only 3 lands in a barrel does not nessesarily mean it will have the longest barrel life. If you took a 3 groove, 4 groove, 5 groove and 6 groove all having the same land width, they would all have the same barrel life given that all barrels were made from the same material and hardness of material. The wider the land crosssection, the longer it will take to erode from firing, simple as that, the thinner the cross section of the land, the faster it will erode. [/QUOTE]
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